/Engine/Source/Runtime/Core/Public/Misc/ExpressionParserTypes.h
Define a binary operator for the specified symbol, with the specified precedence and associativity NOTE: Associativity defaults to RightToLeft for legacy reasons.
template<typename TExpressionNode> void DefineBinaryOperator ( int32 InPrecedence, EAssociativity InAssociativity, bool bCanShortCircuit )